Cam Selection: 228R vs Donald Thump
PTV was good. Since I did the install I'll freely admit I may have done something wrong. As far as the intake goes no idea. I left it sitting on the dyno after saying "fix it" and leaving a deposit for repairs.
Besides the headgasket I feel like something is wrong making 440 with a big cam, heads, FAST intake 6 speed car.
Neither one of the cams you have is my favorite for your setup. You could sell them both and pay for a better sized cam for your setup from summit. They are $289. The sum-8707 would be great for your setup IMO or the 8708 for a large cam, but the 8707 is plenty. Or sell them both and add a few bucks for a texas speed or cam motion cam.
I'm just saying you could do a smaller cam and have a much better driving car and make the same or more power. Unless you're going to do everything you need to do to support that big cam. Which you're close, but I wouldn't be using a 3" Y pipe exh. You need lots of compression and flow..
Neither one of the cams you have is my favorite for your setup. You could sell them both and pay for a better sized cam for your setup from summit. They are $289. The sum-8707 would be great for your setup IMO or the 8708 for a large cam, but the 8707 is plenty. Or sell them both and add a few bucks for a texas speed or cam motion cam.
I'm just saying you could do a smaller cam and have a much better driving car and make the same or more power. Unless you're going to do everything you need to do to support that big cam. Which you're close, but I wouldn't be using a 3" Y pipe exh. You need lots of compression and flow..
Last edited by 00pooterSS; Jan 10, 2020 at 04:23 PM.
Hard to believe PTV was ok on a cam that big, even if the heads were unmilled.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever
Verdad Gallardo
I think that power level on "polished" heads, which means different things to different people...
On an "honest" DJ is Is pretty ******* generous considering the mods and compression,
I won't even talk about MD numbers because no one on the internet uses them because it make your dick feel small.....
Change my mind...
On an "honest" DJ is Is pretty ******* generous considering the mods and compression,
I won't even talk about MD numbers because no one on the internet uses them because it make your dick feel small.....
Change my mind...
While I'm still waiting on word back from the shop I can say that if the Donald doesn't drive well it may get swapped. Just not in a hurry to tear it all down.
Correct, they are ported 799s, not milled at all. I was using an MLS gasket with ARP bolts. HP was rated on a DynoJet.
As for what could be holding it back from better numbers, the push rods were too short. When it dyno'd it had 7.5 length pushrods when it probably needs 7.55 Pushrods. I know, it's a weird length. Yes, I measured but obviously not well.
Running a set of COMP 850-16 lifters or maybe the design of the cam are responsible for needing longer pushrods.
It's been a valuable yet expensive lesson so far. So far I've come away with next time let a pro do it.
Correct, they are ported 799s, not milled at all. I was using an MLS gasket with ARP bolts. HP was rated on a DynoJet.
As for what could be holding it back from better numbers, the push rods were too short. When it dyno'd it had 7.5 length pushrods when it probably needs 7.55 Pushrods. I know, it's a weird length. Yes, I measured but obviously not well.
Running a set of COMP 850-16 lifters or maybe the design of the cam are responsible for needing longer pushrods.
It's been a valuable yet expensive lesson so far. So far I've come away with next time let a pro do it.
While I'm still waiting on word back from the shop I can say that if the Donald doesn't drive well it may get swapped. Just not in a hurry to tear it all down.
Correct, they are ported 799s, not milled at all. I was using an MLS gasket with ARP bolts. HP was rated on a DynoJet.
As for what could be holding it back from better numbers, the push rods were too short. When it dyno'd it had 7.5 length pushrods when it probably needs 7.55 Pushrods. I know, it's a weird length. Yes, I measured but obviously not well.
Running a set of COMP 850-16 lifters or maybe the design of the cam are responsible for needing longer pushrods.
It's been a valuable yet expensive lesson so far. So far I've come away with next time let a pro do it.
Correct, they are ported 799s, not milled at all. I was using an MLS gasket with ARP bolts. HP was rated on a DynoJet.
As for what could be holding it back from better numbers, the push rods were too short. When it dyno'd it had 7.5 length pushrods when it probably needs 7.55 Pushrods. I know, it's a weird length. Yes, I measured but obviously not well.
Running a set of COMP 850-16 lifters or maybe the design of the cam are responsible for needing longer pushrods.
It's been a valuable yet expensive lesson so far. So far I've come away with next time let a pro do it.
Thanks. I do tinker around. First time I've done heads though. I've done a cam swap way back on a 4.8 but it was a very small cam, less than the TSP 220. Other than that it's just been normal bolt ons.
This time around I would definitally do things a bit differently. For now ready to get it back drive it some but unfortunatly it looks like winter has finally come to MD.
I'll post an update after everything is sorted out.
This time around I would definitally do things a bit differently. For now ready to get it back drive it some but unfortunatly it looks like winter has finally come to MD.
I'll post an update after everything is sorted out.
Joined: Jul 2007
Posts: 1,500
Likes: 177
From: ELSA, South TEXAS (956) 802-7700
While I'm still waiting on word back from the shop I can say that if the Donald doesn't drive well it may get swapped. Just not in a hurry to tear it all down.
Correct, they are ported 799s, not milled at all. I was using an MLS gasket with ARP bolts. HP was rated on a DynoJet.
As for what could be holding it back from better numbers, the push rods were too short. When it dyno'd it had 7.5 length pushrods when it probably needs 7.55 Pushrods. I know, it's a weird length. Yes, I measured but obviously not well.
Running a set of COMP 850-16 lifters or maybe the design of the cam are responsible for needing longer pushrods.
It's been a valuable yet expensive lesson so far. So far I've come away with next time let a pro do it.
Correct, they are ported 799s, not milled at all. I was using an MLS gasket with ARP bolts. HP was rated on a DynoJet.
As for what could be holding it back from better numbers, the push rods were too short. When it dyno'd it had 7.5 length pushrods when it probably needs 7.55 Pushrods. I know, it's a weird length. Yes, I measured but obviously not well.
Running a set of COMP 850-16 lifters or maybe the design of the cam are responsible for needing longer pushrods.
It's been a valuable yet expensive lesson so far. So far I've come away with next time let a pro do it.