4V heads

[fullblownstang]

Ok just want to start off bye saying im barely learing about modular motors. I have a 99 mustang Gt and was wondering if any year 4.6L 4V heads would fit on a world block or on my stock block. Also does any body know how well the stock blocks handle boost... Thanks

 

[bryan0]

Welcome

I'm not sure about the heads, but I've heard from many a person that the stock blocks are good for 400rwhp.

 

[streetstang03]

4v heads wont work w/o custom fab work. the block really isnt the weakness in the motor, its the rods and internals. bone stock 2V should hold up to ~420-ish rwhp with a safe tune. i personally wouldnt go past 410rwhp w/o forged internals.

 

[Josh-'96 GT]

Assigning a RWHP number for component durability is insane. Detonation, tune, and RPMs will have way more impact on how long the rotating assembly lasts...

As for boost, the 03/4 Cobras were boosted from the factory and came with forged pistons, so that should give you an idea of what needs to be done for durability sake with a boosted engine...

 

[tomustang]

4v heads wont work w/o custom fab work.

they will just bolt on, you just need a 4V valve cover and all the acessories to go with a 4V setup, cam likes to play with my pants

 

[bdcardinal]

yup, the heads just bolt up. you would loose a lot of compression because of the nature of the 4v head chambers. you just need the 4v front cover and intake manifold as stated above. also you will need to replace the hydroboost with a cobra/mach 1 unit.

 

[fullblownstang]

sounds like funn....... yeah theres no way im going with stock internals on this project. I just dont know too much about ford blocks. Doing a twin turbo set up on it. Just cant wait for all the problems im gonna run in too. Mainly the fuel injection is what im woried about. Dynoed a 427 C5R motor at school (not mine lol). It would idle fine and rev up great without a load on it but once the load was put on the motor it would rev up to 6700 and just back fire and die. The timing would go nuts. This motor is crazy, put out 711HP with a lot left in it. I think this motor is gonna be some where in the 900HP range. Well anyway hope i dont run in too crap like that.