sbc 420 combo

[XTRMEASURES]

i just picked up a 2bolt sbc 400 and would like to stroke it out. the thing i need to know is would the stock block work for what i want. i plan on boreing it out to 4.155 and getting a 3.875 stroke crank. do you guys know if ill have cam/rod issues or even if i have to grind the block for the crank to fit....

any info from ppl that built something in that nature would help me.

[Turbo Hen]

You will be very limited by the stock block....i think you'll be in the aftermarket block territory if you want to build a 420" SBC.

The heads/cam/intake that motor will require to make the power it should will put it over the limit of a stock block. Now there are some people doing it, but they're on borrowed time if you ask me.

-Carm

[Beegs]

Read up and you will see the stock block will cost you some power.

That being said there are many guys on these forums that have built nasty 400 based engines.

Hit the different boards and search for: "406" "400" there isa ton of stuff.

[XTRMEASURES]

thanks guys

[Lowend]

The 400 block with a 3.875 crank makes for a 415cid motor. good combo and about as big as you can go with a OEM block.

A general build forumula would be
AFR 210cc heads
Isky Solid Roller Cam RR-570 (250@050 .570 lift 108LS)
Edelbrock Super Vic Intake
1.75" Primary headers
850cfm carb

Put the compression around 10.5-1 and with the proper tune you will make an easy 520HP 550 ft/lbs

[XTRMEASURES]

wow that would be a strong engine, im also going to bore it out 0.030 over to get the 420. i plan on getting the eagle 4bolt main kit.

[Lowend]

I'll warn you... this is more involved than you probably realize.
I would not attempt this combo with less than $10K in the warchest