[308] 308-304 injection top conversion

[v8commy]

and now looking at these two
http://www.cranecams.com.au/pdfs/holdencams_guidesheet_14-5-07.pdf

part no.Compucam H286
part no.Compucam H304

 

[ari666]

couldnt recommend the 286 high enough, i love mine. the 304 will be way too big for your engine. even still you will need to bump up your comp quite high to use the 286 needs 9:1 as a minimum it didnt really work in my car till i got flat tops and 10.7:1, stock efi heads cc's are bigger than cast iron so i think stock comp is around 8:1 but willing to be corrected.

diff gears are essential, as is a 2500 stall and LT1 springs. so think about that before you go that big a cam.

 

[v8commy]

couldnt recommend the 286 high enough, i love mine. the 304 will be way too big for your engine. even still you will need to bump up your comp quite high to use the 286 needs 9:1 as a minimum it didnt really work in my car till i got flat tops and 10.7:1, stock efi heads cc's are bigger than cast iron so i think stock comp is around 8:1 but willing to be corrected.

diff gears are essential, as is a 2500 stall and LT1 springs. so think about that before you go that big a cam.

can i use springs,lifters, and valves off my carby heads?

 

[v8commy]

can i use springs,lifters, and valves off my carby heads?

 

[ari666]

lifters no. springs no. valves no.

valves are either 1.06 and 2.02 or 1.06 and 1.94 on the EFI heads, cast iron valves are much smaller (cant remember their sizes soz)

you will need LT1 performance springs which will allow you a bit more than 500 lift and you will need to get the headguy to check yor install height is 1.7inch but to use the cam you are gonna need to get bagloads shaved off the head anyway to achieve 9.5:1, so a trip to the headguy would be cruical.

and you can NEVER reuse lifters. the only time you can put old lifters back in is if the cam is the same and the lifters go back on their exact lobe.

all that doesnt matter anyway, you still need high stall and diff gears. a 286 will just bog down and do bugger all till about 70kmph. greenfoam and his buddys know the best cams for efi, you should be pm'ing them and asking. specs are quite a lot lower than the 286's to get a bunch more power.

 

[Immortality]

torque power made 400hp with a VN headed 308 on a 230/[email protected]" cam with there lowrise dual plane manifold.

i'm looking at the kelford cams version of the crane 286 [email protected] but 280 advertised and .515" lift with 1.6 rockers, 109lsa

B cast heads are 1.94" in 1.5" ex.

standard 308 heads are 1.75" in 1.48" ex.

stock compression is 9.2:1 on the blue 308 and 8.8:1 on the 304 i think. best bet is to fit flat top pistons to raise the CR

 

[v8commy]

im thinking ill just shave the heads get a cam,lifters, springs,standard manifold with a 90mm tb and cai and blue tops full system exhaust ive got 345's in the rear and a 2100 stall converter

 

[v8commy]

ive had a look yeh i think im gonna go the 286 by crane

 

[ari666]

lol. well budget for a decent stall converter and flat tops. 2100 isnt even a stall converter, its just a standard torque converter running on less fluid(2500 stall optimal), and shaving the heads MIGHT give you 9.4:1 but still lower than optimal for a 286 (9.5:1). 345 diff is good but still lower than optimal(3.55 optimal).
also, i noticed greanfoam is avoiding this thread, but i am pretty sure he would say something like "the stock manifold would be useless with that cam"

so back to my original post "you gonna run a 304 with a baby cam?" its no where near as easy as just sticking in a high lift high duration cam. you will get much more 'bang for your buck' from getting a tune and a baby cam.

 

[greenfoam]

Lol Ari how did you know, I've had no comment on the direction this is going and haven't for a few days now, it just keeps getting worse, the last I saw was no gain over a stock 304. But if your going to run small cubes and a low budget/low rpm then you need everything matched, banana manifold has no place here because you need the thing to make max power at about 6000 rpm and a stall converter to suit (over 3000). If your going to run 2000 ish stalls and the banana you CAN NOT go over about 218 degrees duration on the intake lobe, well you can, but you will go slower.

Plenty of people have run "good" times (12.9999999) with the 286 and banana with flat tops or a maximum head shave but they are in light VN's with 4000 rpm stalls. Most of the time gained is comming from the stall and gears rather than power