difference between r302 and a4

sn95gt19 · 01-07-2003, 05:24 PM

just wondering what the difference is, i found a fully machined a4 block for 1800, and im thinking i can get a dart block for that much.

what are the differences between the a4 and r 302 blocks

ultraflo · 01-07-2003, 07:27 PM

The biggest difference between the two blocks is that the R302 block has siamese bores, and the A4 doesn't... the cylinders in the R-block are connected internally, in that the coolant doesn't circulate between the bores vs. the A4 bores, that allow coolant to circulate between them, like the factory block.

The R302 block can be bored .125 over, and the A4 can be bored .090 over.

Also, the R-block is factory rated to handle more HP than the A4, mainly due to the siamese bores connecting the cylinders together.

-Ryan

sn95gt19 · 01-07-2003, 11:15 PM

which would be your choice

r302
a4
dart

i can get a new dart block for 1850

ultraflo · 01-08-2003, 08:03 AM

Although I currently have an R-block, if I were to do it again, I'd go with the Dart block. They come fully machined from Dart, and have a true 4-bolt main system (1-5) vs. the SVO blocks (2-4)

01-07-2003, 05:24 PM	#1
sn95gt19 motors done......woohooo Join Date: Mar 2002 Posts: 799	difference between r302 and a4 just wondering what the difference is, i found a fully machined a4 block for 1800, and im thinking i can get a dart block for that much. what are the differences between the a4 and r 302 blocks __________________ 95gt lazer red (98 cobra clone) Rice Haters Club Member #116

01-07-2003, 07:27 PM	#2
ultraflo NX dealer-man Join Date: Sep 1998 Location: Peoria, Illinois Posts: 977	The biggest difference between the two blocks is that the R302 block has siamese bores, and the A4 doesn't... the cylinders in the R-block are connected internally, in that the coolant doesn't circulate between the bores vs. the A4 bores, that allow coolant to circulate between them, like the factory block. The R302 block can be bored .125 over, and the A4 can be bored .090 over. Also, the R-block is factory rated to handle more HP than the A4, mainly due to the siamese bores connecting the cylinders together. -Ryan __________________ RLS Racing! 93 LX 9.20 @ 147mph 03 Mach 1 12.39 @ 116mph

01-07-2003, 11:15 PM	#3
sn95gt19 motors done......woohooo Join Date: Mar 2002 Posts: 799	which would be your choice r302 a4 dart i can get a new dart block for 1850 __________________ 95gt lazer red (98 cobra clone) Rice Haters Club Member #116

01-08-2003, 08:03 AM	#4
ultraflo NX dealer-man Join Date: Sep 1998 Location: Peoria, Illinois Posts: 977	Although I currently have an R-block, if I were to do it again, I'd go with the Dart block. They come fully machined from Dart, and have a true 4-bolt main system (1-5) vs. the SVO blocks (2-4) __________________ RLS Racing! 93 LX 9.20 @ 147mph 03 Mach 1 12.39 @ 116mph

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