4 banger to V-8

[mitchdakid]

Just wanted to know who has done a 4 banger to V-8 carbed swap. If you have please pm me I have a few question about the one I am doing. 86 2.3 liter with 4 speed trani and putting in a 302 and c-4 trani from a 68 mustang.

[351wStang]

Why PM when we can share the info with the whole board? Ask away, my car is an ex 4cyl car. Went from 2.3/aod to 302/c4 to 351w/c4.

[mitchdakid]

Originally Posted by 351wStang

Why PM when we can share the info with the whole board? Ask away, my car is an ex 4cyl car. Went from 2.3/aod to 302/c4 to 351w/c4.

K well going from 2.3 4 speed to carb 302 c-4. Curious about motor mounts and what mods have to be done if any. I have been told both ways, also about the trani k member. I think mine has the 7.5 rear end can i take a 8.8 out of a 86-93 fox and put it in without any modificartions. Not too worried about wiring as not much has to change becuase it is carbed. Any other advice I can get from you, or places you got parts or kits from.

[351wStang]

You can keep the stock K-member and just bolt in some motor mounts for a 5.0. Most people use convertable mounts. As far as the tranny crossmember goes just buy a crossmember from Summit or someone like that, they dont cost much and they are the "double hump" crossmembers for plumbing dual exhaust, the 4cyl version only has one "hump". Yes you can take a 8.8 rear out of another foxbody car and bolt it right in place of your current 7.5. I will post up a link as soon as I can find it on the efi/carb swap and just what all has to be done. There should be not mods needed to physically drop in a 302/c4. Just chanmge motor mounts, tranny crossmember, and rearend just because the 7.5 wont hold the torque of a 302.

[mitchdakid]

Ok now I just have to hope that the motor mounts for the 68 302 are the same as 5.0 ones. Have never looked or played with a fox 5.0. I think I should be pretty set then, just have to have the driveline shortened from the donor 5.0 I think will know for sure when I get it all set it. Thanks if I have anymore questions I will be sure to ask. Any more advice let me know. Thanks again I will let you know the progress, the 302 going in is a low compression about 8.5-1 with twin turbo set-up I made.

[351wStang]

I'd say the '68 mounts will be different. They will probably be a different height, also they could position the motor more forward or backward in the bay. Your best bet would be to just buy some new motor mounts.
If your going TT you would be better off to buy an aluminum FMS driveshaft, the stocker wont take a whole lot of torque.

What is your setup and how much power are you looking to make? I just sold my Vortech S-trim supercharger, my turbo kit should be here next week. I bought a B&G turbo kit with a PT76GTSP turbo. Keeping the boost down to 12psi or so should keep me around the 650rwhp 700rwtq range. Not bad for a street car running pump gas.

[mitchdakid]

Originally Posted by 351wStang

I'd say the '68 mounts will be different. They will probably be a different height, also they could position the motor more forward or backward in the bay. Your best bet would be to just buy some new motor mounts.
If your going TT you would be better off to buy an aluminum FMS driveshaft, the stocker wont take a whole lot of torque.

What is your setup and how much power are you looking to make? I just sold my Vortech S-trim supercharger, my turbo kit should be here next week. I bought a B&G turbo kit with a PT76GTSP turbo. Keeping the boost down to 12psi or so should keep me around the 650rwhp 700rwtq range. Not bad for a street car running pump gas.

Looking for around 400 out of this 302. My 351 is around 500 so trying to make this 302 unique yet pwerfull. I will pick up some polyurethane 5.0 mounts and bolt them to the engine.

[351wStang]

You can make 400rw with a T70 on a stock long block. What all have you done to the motor? Going carb or EFI?

[mitchdakid]

Originally Posted by 351wStang

You can make 400rw with a T70 on a stock long block. What all have you done to the motor? Going carb or EFI?

Carbed 302 motor is being built right now, machine shop is supposed to be building it for 8.5-1 compression actually just got it over there couple days ago. Going to start off with the single turbo set-up get it on a dyno, then put the twin turbo on there. Kind of leaving it up to the shop to build this one because I am not familiar with internals for a turbo motor.??

[351wStang]

Well If you like I can get you in touch with the right people for a blow thrue carb turbo motor.
If you are useing a stock 302 block, I would suggest forged internals. You dont need a 4340 steel crank but it wouldnt hurt. The main thing that breaks stock 302 blocks is crank flex. I would suggest that you get a set of Scat or Eagle 4340 H-beam rods and some forged pistons, Probe or SRP are a good bang for the buck in lower hp applications. By lower hp I mean around 600hp or so. You dont need Diamond or JE pistons in a stock block, the block will fail long before those pistons will. Also I would suggest a set of Felpro MLS head gaskets, they are a multi layer steel gasket much like cometics, but you wont have to worry about blowing headgaskets like you would with the blue or "paper" gaskets. The SBF only has 10 head bolts per head, thats 2 per cylinder. This means that you would be more prone to lift a head under boost with a small block ford then you would with a chevy which has 3 bolts per cylinder. But, with the mls gaskets they will or atleast should let go before you melt a piston if the tune is off. Af far as the top end goes since your just looking for 400hp or so I'd suggest some Edelbrock performer rpm heads and a Weiand Xcellerator intake. The F303 camshaft on 1.6 roller rockers would be a nice match. Now for the carb generally the Holley 4150 carbs are the easiest to mod and tune for blow thrue. Do Not buy one of the new Demon blow thrue carbs, they are a mass produced carb that will take tons of tuning and they are currently having problems getting these carbs to move enough fuel for boosted applications. If you want to buy a carb custom built for you I would highly recomend CSU www.csucarbs.com . They have the absolute best customer service I have ever dealt with. I called Kevin from CSU on a saturday and he helped me tune my car over the phone for some street driving. I have also called Kevin from the dyno and he has been dead on with any adjustments that needed to be made. You wont find that kind of service from Demon, they will tell you they cant help you, it wouldnt be the first time.
Go to www.turbomustangs.com and do some research in the carb/boosted forums. I am a member there as well and I can promise you that if you follow the suggested methods you will not be dissapointed. Dont skimp on the fuel system, that will make or break your ride. There are a great bunch of guys over at TM.com that do this stuff every day, if you have a question they have your answere.

You dont have to take my advice but I hope you atleast check out the websites I mentioned. They will be a great help to you with your project.
Best of luck to ya!

[351wStang]

If you want to save some money and modify your own carb for blow thru here is a tech article that shows in great detail every step that needs to be made.
http://www.hangar18fabrication.com/blowthru.html