bigdavesiroc

starting to build my 406 using a custom ground solid roller cam, mahle pistions, afr 190 heads, holley pretender intake, 830 carb(a original 400 carb), and hedman headers, probably to small
_1-3/4 primaries. shooting for 520-550. compression is going to be around 11.7-1.

ndamron

iTrader: (3)

427 small block by world, with some aluminum heads, and a custom ground cam from comp...


should pull 630hp, and 600 tq...give or take....this is a composite guess from many different sources.

I think it's sweet you built a 406, good job man!

~Nick~

heavy_chevy29

i have a 434sbc. it made 576hp and 582 ft-lb on the engine dyno

bigdavesiroc

any home built 400's out there??not to take away from buying a eng shop built motor. just curious

ndamron

iTrader: (3)

i built mine, just ordered the short block.

~Nick~

grover85

iTrader: (1)

Mine is. I just got a rebuild kit from summit and did mine. It makes 425 hp and 480 ftlbs. Thats with stock heads.
Also with TPIS Big mouth tpi system

ndamron

iTrader: (3)

lets all get together and go pick on some imports

~Nick~

likeenz24

iTrader: (2)

I built mine, but has never been on a dyno....ran 7.50 1/8 with stock 342 gears....https://www.thirdgen.org/techbb2/sho...hreadid=322256

bigdavesiroc

your eng bay looks great....i want your valve covers so bad but will put the extra money somewhere else

likeenz24

iTrader: (2)

thanks....they where kinda exspensive....

Air_Adam

Local guy here (also on TGO, but don't recall SN) made something like 365 rwhp with a 400, AFR heads, solid roller cam, demon 4bbl, and Air Gap RPM intake.

What scares me is that it sounds tamer than my mid-14 second 350... and he runs between 12.2 and 11.9

bigdavesiroc

well with the parts we are using, should run right around the 500 mark...with race gas...should put the car in the mid 11's...but i may be on the optimistic side. i guess it just all depends on traction. i have seen magazine claims of cars running 11's with only 350 rwhp, but they are at e-town which seems to be one of the better traction tracks around.

chesterfield

"any home built 400's out there??"


My work in progress:
'88 caprice carb ecm(police 350)
509 standard bore block
11.3:1 compression flattop silvolite pistons
w/193 heads (home ported)
l69cam, exhaust manifolds and dual snorkel
quadrajet and factory dual plane intake


can I boast 250 hp? did I mention I have an aluminum driveshaft?

LilJayV10

iTrader: (5)

My 406:

stock crank and rods, hyper pistons, balanced

288XR hydraulic roller cam, 288/292 236/242 @ .050, don't remember lift

protopline 220cc heads, air gap intake, 1 3/4 headers, 750 holley

estimated around 500 hp

the car ran 7.8's in the 1/8 in radial tires with no suspension work or tuning, and with the second ring installed upside down. Hooked up with good compression it should have ran mid 7's or better.

I was going to get rid of this engine but decided to keep it. I love this engine.

bigdavesiroc

any pics??

406maro

iTrader: (1)

do you guys with 406's have any trouble with it hitting the stock hood, or are you running an aftermarket hood?

Irockz

iTrader: (1)

Mine made 543hp on the dyno.My only reccomendation to you is to go for a larger runner size.195cc is big,but these large bore motors like a 215-230cc range.If it were mine,and I was shelling out the cash for AFRs,I'd go for the 220s.

As far as hood clearance,a 400 block has the same external dimensions as any smallblock,so it's still dependant on your intake/carb combo.

bigdavesiroc

well the heads were just available for pretty cheap. my father in law is doing the build in his shop. he had them so we'll use them. should be a pretty streetable combination. the cam lift is .510 @50 and duration is 234/240 @ 50...so the flow numbers are good at .500 and .400 lift. which is as high as the cam is. if i am not happy with them, i might step up to the 210/215 cc range later.

grover85

iTrader: (1)

I was curious on what 400 liked for heads cause I am thinking of doing the world 200cc or 220cc heads with a tpis mini ram intake.

Air_Adam

Why would you? Its the same size as a 305 or 350...

Air_Adam

When building a 400, build it with parts about 10% "bigger" than what you'd need on a similar 350.

bigdavesiroc

well as soon as mine is built it will be eng dyno'd....so i'll be sure to post some numbers. i am curious my self to see exactly what hp we can make with these 190's. they are the heads the afr 195 replaced...but both have pretty identical flow numbers. so if i can only manage 400's, i'll be saving for the 210-220 size afr's.