Pro Performance Heads, Cont...
11-06-2002 | 06:05 PM
#78
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Registered User
Joined: Sep 2002
Posts: 8
From: Keller
An update on the 2nd set of Pro Perf. heads. We got everything back together today and started her up. Now there is a pronounced knock that sounds internal. The rockers have been readjusted several times and determined that is not it. The knock seems lower in the engine. If anyone has any suggestions, please post quick because we are probably going to pull the engine and get the bottom end torn down. The fear is a cracked rod or something similar from a slight hydrolock due to the coolant leaking with the original heads. Sound familiar anyone?
11-06-2002 | 06:09 PM
#79
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Joined: Oct 2000
Posts: 786
From: Charlotte, NC
11-06-2002 | 06:33 PM
#82
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Joined: Nov 1999
Posts: 541
From: Shreveport La.
Originally posted by Mr. Horsepower
I wouldn't run a single pattern with a 67% I/E either.
I wouldn't run a single pattern with a 67% I/E either.
95- Has the motor been run before or is it brand new?
Was it clearenced properly and machined accordingly? Night Train also made a good point. The oil pan could be getting hit. Just a few things to check. I don't even know if hydrolock would cause a audible knock in a slight case. Most knocks usaully come from a bad rod bearing or something making solid contact. I guess it just depends on whats wrong. Don't go jumping to conclusions... yet...
11-06-2002 | 07:50 PM
#83
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Joined: Aug 2002
Posts: 1,509
From: Red Oak Texas
I just remembered that the 383 was running before with stock heads, etc.
I am sure the knock is new then. A hydrolock could cause a bent rod or wrist pin. Either one could be an audible bottom end knock.
I guess we can eliminate the rods hitting the oil pan theory.
NightTrain66
I am sure the knock is new then. A hydrolock could cause a bent rod or wrist pin. Either one could be an audible bottom end knock.
I guess we can eliminate the rods hitting the oil pan theory.
NightTrain66
11-06-2002 | 08:26 PM
#85
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Registered User
Joined: Sep 2002
Posts: 8
From: Keller
Thanks for the replies guys. The engine ran about 4-5k miles with stock top end after the 383 rebuild. Getting the top end done has been a nightmare with the heads and all. Hopefully we will get it figured out soon. We'll see if PP is willing to help with repairs. They have been informed. BTW, it def. is something internal as opposed to rod hitting pan. I wish it was that easy!
11-06-2002 | 10:32 PM
#87
Registered User
Joined: Nov 1999
Posts: 541
From: Shreveport La.
Cody, the damage would (if in fact it is from the heads) have been caused by the first set of heads that he recieved. In turn, they should have been tested, but I don't think they were testing yet when he recieved his.
11-07-2002 | 04:40 AM
#88
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Joined: Apr 2000
Posts: 524
From: Fort Worth , TX
Beast
Beast, thanks for your input on the set up, When I had the 355 done with the cam and heads, I really did not know what I was getting in too. I had a shop here pick the cam, actually thats the only think I really did not do any research on.
By the way I wasn't trying to bash you or any comments you made,
It was the post about the $1500
" Your GTP heads might not make the power that some of their heads make on other peoples cars but at least they didn't leak water and the valve guides were still there. You understand the importance of these little problems don't you?"
my point for $1500 you should get what was agreed it to and because they didn't leak does not make them worth $1500
My 1/4 time was 12.60 at 109 wtih a 1.89 60ft the reason I don't post this is because it was my first time and only time I have been to Ennis. 1/8th on that run was 8.07 race weight was 3580 in street trim.
The 1/8th mile time I have posted is from kennedale, it is best run I have had.
Later
Jose`
By the way I wasn't trying to bash you or any comments you made,
It was the post about the $1500
" Your GTP heads might not make the power that some of their heads make on other peoples cars but at least they didn't leak water and the valve guides were still there. You understand the importance of these little problems don't you?"
my point for $1500 you should get what was agreed it to and because they didn't leak does not make them worth $1500
My 1/4 time was 12.60 at 109 wtih a 1.89 60ft the reason I don't post this is because it was my first time and only time I have been to Ennis. 1/8th on that run was 8.07 race weight was 3580 in street trim.
The 1/8th mile time I have posted is from kennedale, it is best run I have had.
Later
Jose`
11-07-2002 | 07:04 AM
#89
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Joined: Aug 2002
Posts: 1,509
From: Red Oak Texas
I am not sure what GTP heads ya have and if they have changed any but the ONLY LT1 GTP heads that I have tested flowed in the 250 / 190 range. These are about 1 yr old and I do not know if this was an "OFF" set or if they all flow this. I do not know if they are getting more CFM from them now than then but I was kinda expecting more. The customer was actually hoping for these crummy #s so he would know why his car was not making the power he felt it should have with his set up. He paid $ 2200 ( I think) plus cores and I think they were stage 2.
Anyone know what kinda #s GTP claims with these heads?
Just curious.
NightTrain66
Anyone know what kinda #s GTP claims with these heads?
Just curious.
NightTrain66
11-07-2002 | 10:54 AM
#90
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Joined: Aug 2000
Posts: 4,305
From: North Vancouver, BC
Yes same here, at first I thought the reason I made no power was my tranny but wanted to sell the car & get an M6 anyways which I did, but the heads I had were GTP stage II's that flowed 269/210 @.550 according to GTP, but the guy I sold the heads to made no power either, & before he got the heads from me I sent them GTP to get refreshed & GTP confirmed once again of those flow numbers, when the guy made no power he flowed them locally & got 250/189 I thinik for flow, so there you have it.