ok so,.. Going off the setup above a friend of mine said thats a relatively small cam? Im wanting to do same thing but looking at road racing and autox more than drag. What is your input? And be little lamins terms with me on cam talk. Slowly learning.

 

What setup above? the 95 LT1? That isnt a gigantic cam in that 383 but its no small cam either. Its the GM847 cam and its a nice overall cam for any application. Wide duration split can handle some nitrous, and it will give a nice wide powerband in the upper rpms. Wide power band is great for roadrace/autoX. My old 383 cam was great overall cam as well. Liked nitrous, was great on motor alone, and made a ridiculous powerband perfect for road race as well. It was a 230/245 cam on a 109 lsa, .603/.613" lift with 1.6 rockers. Wider duration splits I believe help give an extended rpm range. May peak at say 6300 rpm but will not fall off until way after 6600 rpm, shift by 6700-6800. Thats a pretty good powerband in the 6000-6800 rpm range.

 

ok so,.. Going off the setup above a friend of mine said thats a relatively small cam? Im wanting to do same thing but looking at road racing and autox more than drag. What is your input? And be little lamins terms with me on cam talk. Slowly learning.

 

so you would go with that cam? That the 95 has? Or yours?

 

because of the reverse cooling in a LT1, would i be looking for a specific engine block? or is the 350 block the same (minus the main bolts and rear seals from different setups) and the difference is in the intake setup?

 

Gen II blocks are unique. If you're building a Gen II LT1/4, you need a Gen II block.

 

Custom grind for your application is what I'd go for but thats just me. You tell the cam guy what you want to have happen on your exact motor and he will give you what you need. My cam did what i needed it to do for my car but doesnt mean its a great cam for a different motor.

 

thanks, i needed to know that

 

I am getting way deep now. what do you guys think about this setup? Patriot Performance 2047 - Patriot Performance Freedom Series Small Block Chevy LT1 Cylinder Heads 58cc i believe and a comp cams 306: 230 int./244 exh. and 0.510 int./0.540 exh. lift, or thro something out there that will work well with these heads:

https://www.patriot-performance.com/...1&cat=0&page=1

oh 383 short block with keith black hypereutectic pistons

 

ifi know my heads right..... those are not that bad. and isnt a custom grind real pricy?

 

yeah someone told me about these heads. said they are real decent for the price. thats what got them to my attention.
I am sure a custom grind would be pricey. I dont understand too much about cams i guess this needs to be my next research item.

If i am running these heads my compression ratio is gonna be up around 11.5 to 1 with flat tops. SO I am looking into another head.

 

http://www.ls1tech.com/forums/lt1-lt4-modifications/


try this

 

says page not found

 

sorry


http://www.ls1tech.com/forums/lt1-lt4-modifications-31/

check out stickys on top of thread

 

u r the man for this link, sir. thank you. i was just googling trying to find info along this line. reading this i am gonna have to back off my cam selection a little bit i am liking the Crane 227: well something similar just in hydraulic

 

i think i will go with custom. Get a deal when you port the heads by i forgot the guys name. yeah if i can help with anything just ask!

 

yeah i wanted to go with aluminum heads but I keep hearing about people having head problems with them in LT1s so i guess i will stick with the old iron head. no big deal i guess it still just a street car

 

what type of head problems? I had an LT1 with over 150k miles on it with the stock heads. There's a local guy putting 500 to the wheels with a 383 LT1 with ported/polished stock castings and supercharged as well.

 

i guess i should clarify that. i have been told by that many have gasket retention issues. I didnt mean that aluminum heads are junk on these setups. jumped the gun a little, sorry

 

so then what is main benefit for 6 inch rods? Higher compression? Would you get less with shorter rod?

Also side note i wonder if titanium rods out of ls9 would fit and how much they are?

 

Main benefit of 6" rods is that you can use a lighter weight piston since the compression height of the piston is smaller than pistons designed for 5.7 rods. This means less stress on the rod bolts which helps when turning higher rpms.

Rods do not effect compression ratio.

LS rods wont work in sbc's i dont believe, the journals are sized different on the cranks.

 

If anyone is still following this post here is what I am going with:

2 bolt main block 40 over
EAGLE" cast 3.75" stroke crank and forged domed pistons (speed pro) and speed pro moly rings
Cloyes Double Roller Timing Chain
Electric water pump
Hi Volume Oil Pump
Comp Cams 503 (224/230 .537/.544 112lsa)
Iron Heads with 1.5rrs and 3-angle finish on the 1.96"x1.55" valves and 100# springs.

I am gonna have the heads ported and polished with the intake, running a cold air intake. 411 gears with a TH400 with 2800 stall. Am i putting together a solid setup here? Anyone
And I am gonna buy the program to reflash the pcm to tweak it

 

should i upgrade to the 1.6rrs with this cam and piston setup?

 

why dome pistons? the compression is gonna be through the roof with those iron heads. Flat tops will give 11 to 1 on a 383 with 64cc chambers which is still high for a iron head motor.

Cam isnt bad but if it is a hydraulic roller which it looks like from the lift that cam has, then go with springs that have more like 130 lbs on the seat

 

oops i meant dished pistons and cam is a hydraulic roller. that sound better? I am going with dished pistons now because I may go with some sort of forced induction. depends on what they setup runs once i get it on the track

 

this is my thought. if you drive it often i dont know about 40 over heard it can over heat easier. and if you are taking it to a machine shop why not have them drill and tap for splayed caps? and make it a 4 bolt? extra security imo. ex if you are going to boost

 

i did type 40, I meant 30 over. (I need to start proof reading my relies) And I dont drive it too much its a toy. The builder said for the mild hp i would be putting down, in his own opinion it would be wiser for me to invest the money elsewhere than in the splayed cap setup. I should be well under 500hp with this motor