355 cylinderheads

89Gmcsierra · Posted: Wed Oct 31, 2012 12:07 pm Post subject:

I've debated on it. i have newer block so roller was factory thought about making full roller engine. free few horse up. also idk i have 400 ideas in my head. I've debated on selling mine also lowering compression and supercharging. my original plan was twin turbo and had it 90% complete and it screwed a piston over. then tear down see my heads been shaved and pistons were flat tops. and not running next year and building 565ci big block. too many ideas to blow money too fast lol.

89Gmcsierra · Posted: Wed Oct 31, 2012 4:10 pm Post subject:

didn't read but hood clearance. i think with short air-filter i could damn near have a 6-71 blower under the hood. with 2-4" cowl i know i could. idk see how this winter goes. debated on putting a vortech supercharger on and going to this cam.

Comp Cams lobe numbers: 4873S/4873S
Duration at 0.050 tappet lift: 236/236
Lobe lift: 0.377/0.377 inch
Observed lift: 0.600/0.600 with 1.65:1 rockers and 0.022-inch lash
Lobe separation angle: 115 degrees
Valvespring diameter: 1.550 inches
Valvespring installed height: 1.860 inches
Spring pressures: 175 lbs on the seat, 420 lbs open

guess find out around tax time what happens. the cheap $2000 kit the supercharger is good for up to 17 psi factory set @ 5psi. so there's lots of potential in a cheaper supercharger and it will bolt right up to my serpentine setup.

squeeezer · Posted: Wed Oct 31, 2012 5:15 pm Post subject:

i have gmpp fast burn heads, intake,with new 7/16 studs rockers and jomar girdle
i have paul p's old cam (needs regrind)on 112 center
made 460 horse na

and you dont need 59 cc chamber to get 10 to 1
mine with flat tops = 10.38 to 1

squeeezer · Posted: Wed Oct 31, 2012 5:16 pm Post subject:

ohhh yeah its a 355

89Gmcsierra · Posted: Wed Oct 31, 2012 6:05 pm Post subject:

Well what do you need to have for the heads? ill run my cam until I decide to upgrade to supercharger or turbo. I've seen mild engine builds @ 10:1 wit h my cam mid 400 horse

af2 · Posted: Wed Oct 31, 2012 9:08 pm Post subject:

89Gmcsierra · Posted: Wed Oct 31, 2012 9:13 pm Post subject:

That would be mine. Bought the hat off eBay thinking it would be decent paid 95 for it and intake pipes are 2" OD

clay · Posted: Thu Nov 01, 2012 9:49 am Post subject:

You do know this isn't a plug problem right?? This is usually closely followed by a piston problem or a head gasket problem...... I have been unfortunate enough to collect a few like that over the years. I think Champion plugs have softer ground straps than other plugs but this will actually save you by showing signs sooner. Clay

89Gmcsierra · Posted: Thu Nov 01, 2012 5:17 pm Post subject:

engine has maybe 1000 miles and head gaskets maybe 100 miles since that. i replaced to my normal plugs i run and runs like a million bucks. engine was built july 2011 idk not the biggest far of chrome rings :S seem not to seal until its warm. cold and sitting for a week i get 165-175lbs after its ran some time in last day its normally right @ 200 lbs. idk i've only replaced 1 piston in my build it was a pre built engine before from Horn Racing Products Cedar Rapids Iowa. so i had 7 used 1 new and its cylinder 8 and 2 that burned the plugs. cylinder 1 is new. but they all look new.

and they were still in good shape no detonation marks or Anything

89Gmcsierra · Posted: Sat Mar 09, 2013 3:51 am Post subject:

got bored so looked up specs on Vortec cylinder heads. well i sold my 355, and it some how came back to me. long story 200 dollars richer. so cylinder heads are a must. just curious if its worth buying these heads or waiting to buy nicer Heads? trying to be cheap about it and have bang for buck but dont want to screw myself over?

Factory 193 TBI 1.94/1.50 175CC runners
Valve Lift Intake Flow Exhaust Flow
.3 146.5 112.3
.4 154.7 125
.5 160.4 129.2
Factory 906 vortec 1.94/1.50 170CC runners @ $150 set used Assembled
Lift Int flow Exh flow
.3 196 122
.4 228 156
.5 237 172
.6 243 178

Ported Vortec 906 2.05/1.60 200CC runners @$550
Lift Int flow Exh flow
.3 200 160
.4 238 185
.5 250 195
.6 252 205

http://www.racingjunk.com/Heads/2912358/350-Vortec-Ported-Performance-Racing-Heads.html

89Gmcsierra · Posted: Sun May 05, 2013 11:06 pm Post subject:

Engines in a 1975 Camaro picked up a pair of fully ported polished double hump heads 2.02/1.60 60CC guide plates screw in studs 1.60 roller rockers. with friends old 360 it ran 14.6. shit part 2.56 gear. next time will have either 3.73 or 4.11, first time @ the strip will be saturday if it stops raining here videos will be uploaded to youtube.